Alert archive / Texas / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 17, NWS Houston/Galveston, TX

April 20, 2006San Jacinto County, Trinity County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 20, 2006, 10:41 PM CDT for San Jacinto County, Trinity County, Texas. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 20, 2006, 10:41 PM CDT (03:41 UTC)
Expired
Apr 20, 2006, 11:27 PM CDT
In force
46 min
Issued by
NWS Houston/Galveston, TX
Area
Counties, with a storm outline in the text

Counties San Jacinto County, TX, Trinity County, TX

The radar

The Houston radar (KHGX), 152 km from the middle of the area, began a volume at 03:42 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 20, 6:34 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 3.7 hours before the alert went out and 203 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Lake Charles Mun, LA at 00:00Z on 2006-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 479 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 00:00Z on 2006-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -34 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
479 J/kg
Mixed-layer CIN
-150 J/kg
Mixed-layer LCL
1245 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
-34 m²/s²
0-3 km storm-relative helicity
-15 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.3

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Houston/Galveston, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 20, 9:25 PM CDT, 1 hour 16 minutes earlier.

Area forecast discussion, Apr 20, 9:25 PM CDT, 1 hour 16 minutes before
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Hazardous weather outlook, Apr 20, 8:28 PM CDT, 2 hours 13 minutes before
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In the hours before

Local storm report, Apr 20, 8:35 PM CDT, 2 hours 6 minutes before
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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
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Local storm report, Apr 20, 8:50 PM CDT, 1 hour 51 minutes before
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  <title>Service Notice</title>
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</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
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Local storm report, Apr 20, 10:14 PM CDT, 27 minutes before
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<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
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The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 20, 7:20 PM CDTTornado WarningHGXGrimes, Waller40 min
Apr 20, 7:28 PM CDTTornado WarningHGXWashington21 min
Apr 20, 9:04 PM CDTSevere Thunderstorm WarningHGXBrazos, Burleson56 min
Apr 20, 9:30 PM CDTSevere Thunderstorm WarningHGXGrimes, Madison60 min
Apr 20, 9:56 PM CDTSevere Thunderstorm WarningHGXHouston, Montgomery, Walker64 min
Apr 21, 4:44 AM CDTSevere Thunderstorm WarningHGXAustin, Colorado61 min
Apr 21, 5:23 AM CDTSpecial Marine WarningHGX2 hr
Apr 21, 5:24 AM CDTSevere Thunderstorm WarningHGXFort Bend, Jackson, Wharton66 min
Apr 21, 5:44 AM CDTSevere Thunderstorm WarningHGXHarris61 min
Apr 21, 6:01 AM CDTTornado WarningHGXFort Bend29 min
Apr 21, 6:07 AM CDTSevere Thunderstorm WarningHGXSan Jacinto23 min
Apr 21, 6:15 AM CDTSevere Thunderstorm WarningHGXBrazoria, Matagorda60 min
Apr 21, 6:29 AM CDTSevere Thunderstorm WarningHGXFort Bend31 min
Apr 21, 6:36 AM CDTSevere Thunderstorm WarningHGXPolk39 min
Apr 21, 6:42 AM CDTSevere Thunderstorm WarningHGXHarris48 min
Apr 21, 6:44 AM CDTSpecial Marine WarningHGX2 hr
Apr 21, 6:55 AM CDTSevere Thunderstorm WarningHGXGalveston50 min
Apr 21, 7:18 AM CDTSevere Thunderstorm WarningHGXChambers42 min
Apr 21, 7:23 AM CDTSevere Thunderstorm WarningHGXLiberty37 min
Apr 21, 8:47 AM CDTSpecial Marine WarningHGX43 min

Nearby

Severe Thunderstorm Warnings in Texas, 2006Every severe thunderstorm warning in 2006

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.